• Title, Summary, Keyword: Energy storage system (ESS)

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Field Tests of DC 1500 V Stationary Energy Storage System

  • Lee, Hanmin;Kim, Gildong;Lee, Changmu;Joung, Euijin
    • International Journal of Railway
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    • v.5 no.3
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    • pp.124-128
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    • 2012
  • The ESS(energy storage system, here after) for a DC 1500V was developed in 2009. A ESS was installed on the track of Daejeon HRT in 2010. The advantage of the ESS is that it can save the energy and plus stable the catenary voltage. This paper presents the energy saved by the ESS in Daedong substation. When the ESS is on/off, the field tests are performed.

Economic Feasibility of Energy Storage System connected with Solar /Wind Power Generation (태양광/풍력 연계 기반의 ESS 경제성 분석)

  • Lee, Yong Bong;Kim, Jeong Ho
    • Journal of Energy Engineering
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    • v.24 no.3
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    • pp.74-81
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    • 2015
  • Currently, the government is encouraging the introduction of energy storage system to reduce carbon emissions and peak power demand. The government is planning the cumulative capacity of ESS of 2GW in 2020. By utilizing charge and discharge of the ESS, it is possible to sell the surplus power to utility and electricity market. This paper suggests the model that economic feasibility of energy storage system for planning the construction of power generation facilities in 2035. Our results of simulation indicate the energy storage plan of utility for constructing renewable energy facilities is need to incentives from the government to encourage power utilities and expansion of ESS.

Design and Implementation of an ESS for Efficient Power Management of Stand-Alone Type Street Lights (효율적 전력 관리를 위한 독립형 가로등의 ESS 설계 및 구현)

  • Kang, Jingu
    • Journal of the Korea Society of Digital Industry and Information Management
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    • v.12 no.2
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    • pp.1-6
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    • 2016
  • Several efforts to replace the use of existing fossil energy resources have already been made around the world. As a result, a new industry of renewable energy has been created, and efficient energy distribution and storage has been promoted intensively. Among the newly explored renewable energy sources, the most widely used one is solar energy generation, which has a high market potential. An energy storage system (ESS) is a system as required. In this paper, the design and implementation of an ESS for the efficient use of power in stand-alone street lights is presented. In current ESS applied to stand-alone street lights, either 12V~24V DC (from solar power) or 110V~220V AC (from commercial power) is used to recharge power in systems with lithium batteries. In this study, an ESS that can support both solar power and commercial power was designed and implemented; it can also perform emergency recharge of portable devices from solar powered street lights. This system can maximize the scalability of ESSes using lithium batteries with efficient energy conversion, with the advantage of being an eco-friendly technology. In a ripple effect, it can also be applied to smart grids, electric vehicles, and new, renewable storage markets where energy storage technology is required.

Potential Revenue Prediction Method of ESS using Lithium-ion Battery (리튬이온 배터리를 이용한 에너지저장장치 시스템의 잠재수익 산출 기법)

  • Won, Il-Kuen;Kim, Do-Yun;Jang, Young-Hee;Choo, Kyung-min;Hong, Sung-woo;Won, Chung-Yuen
    • Proceedings of the KIPE Conference
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    • pp.423-424
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    • 2016
  • Recently, the mass production of Energy storage system (ESS) is actively perform around world. Energy storage system is a technique that stores power to energy storage device to supply energy into grid and load at peak-load. Therefore, the efficient energy management is available by using ESS system. The life of Lithium-ion battery is varied corresponding to the power usage, especially selected depth of discharge (DOD). The lifetime of battery is the one of the most issue of the ESS system because of its stability and reliability. Therefore, lifetime management of battery and power converter of ESS module is required. In this paper, the battery lifetime management method estimating residual power and lifetime of lithium ion battery of ESS system is proposed. Also, total avenue prediction of ESS system is simulated considering the total lifetime of battery.

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Contribution of an Energy Storage System for Stabilizing a Microgrid during Islanded Operation

  • Kim, Jong-Yul;Kim, Seul-Ki;Park, June-Ho
    • Journal of Electrical Engineering and Technology
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    • v.4 no.2
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    • pp.194-200
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    • 2009
  • In this paper, the cooperative control scheme of micro sources and an ESS (Energy Storage System) during islanded operation is presented and evaluated by a simulation study. The ESS handles the frequency and voltage as a primary control. Then, the secondary regulation control returns the cur-rent power output of ESS into a pre-planned value. The simulation's results show that the proposed co-operative control scheme can regulate the frequency and voltage and reduce the consumption of the stored energy of ESS.

A Study on the Method to Evaluate Minimum Capacity of Energy Storage System(ESS) for Micro-Grid Design (마이크로그리드(MG)의 설계를 위한 에너지저장장치(ESS)의 최소용량산정 기법에 관한 연구)

  • Lee, Jae-Gul;Shin, Jeong-Hoon;Choy, Young-Do;Nam, Su-Chul;Kim, Tae-Kyun
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.23 no.10
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    • pp.52-58
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    • 2009
  • In this paper, we propose a probability method to determine minimum capacity of energy storage system(ESS) for Micro-grid Because of high capital cost of ESS, It's very important to determine optimal capacity of ESS and for stable operation of Micro grid(MG), we should determine minimum capacity of ESS. The proposed method has abilities to consider forced outage rate of generators and intermittent of non-dispatchable generators and minimum capacity make MG keep energy balancing by oneself.

Designing Test Methods for IT-Enabled Energy Storage System to Evaluate Energy Dynamics

  • Kim, Young Gon;Kim, Dong Hoon;Lee, Eun-Kyu
    • Journal of Information Processing Systems
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    • v.13 no.6
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    • pp.1487-1495
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    • 2017
  • With increasing interests in renewables, more consumers are installing an energy storage system (ESS) in their backyards, and thus, the ESS will play a critical role in the emerging smart grid. Due to mechanical properties, however its operational dynamics must be well understood before connecting the ESS to the smart grid (and eventually to an IT system). To this end, we investigate charging and discharging processes in detail. This paper, then, proposes methods for four type tests (state of charge test, conversion efficiency test, response time test, and ramp rate test) that can assess the dynamics of the ESS. The proposed methods can capture accurate delay values of mechanical processes in the ESS, and it is expected for those values to help design real-time communication systems in the smart grid involving the ESS.

Energy Storage System Model for Facility Plan Connected with Solar and Wind Power Plant (태양광/풍력 연계 기반의 에너지저장장치 설비계획 모델링)

  • Lee, Yong-Bong;Kim, Jeong-Ho
    • Journal of IKEEE
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    • v.19 no.3
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    • pp.295-303
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    • 2015
  • Considering to Energy Storage System (ESS) is a global trend In order to reduce global warming and carbon emissions. South Korea has announced various policies to vitalize the development and uptake of renewable energy. South Korea is planning the cumulative capacity of ESS of two million kW in 2020. According to the government support and development of technology companies, the battery of ESS prices are expected to fall gradually. In this paper, we develop a planning model that take into account the supply expansion of technology of ESS and prices. Based on planning model, we analyze the cost of ESS linked with wind power and the revenue for trading electricity and renewable energy certifications.

Method of Minimizing ESS Capacity for Mitigating the Fluctuation of Wind Power Generation System (풍력발전의 출력 변동 저감을 위한 ESS 최소용량 산정기법)

  • Kim, Jae-Hong;Kang, Myeong-Seok;Kim, Eel-Hwan
    • Journal of the Korean Solar Energy Society
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    • v.31 no.5
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    • pp.119-125
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    • 2011
  • In this paper, we have studied about minimizing the Energy Storage System (ESS) capacity for mitigating the fluctuation of Wind Turbine Generation System (WTGS) by using Electric Double Layer Capacitor (EDLC) and Battery Energy Storage System (BESS). In this case, they have some different characteristics: The EDLC has the ability of generating the output power at high frequency. Thus, it is able to reduce the fluctuation of WTGS in spite of high cost. The BESS, by using Li-Ion battery, takes the advantage of high energy density, however it is limited to use at low frequency response. To verify the effectiveness of the proposed method, simulations are carried out with the actual data of 2MW WTGS in case of worst fluctuation of WTGS is happened. By comparing simulation results, this method shows the excellent performance. Therefore, it is very useful for understanding and minimizing the ESS capacity for mitigating the fluctuation of WTGS.

Performance Degradation of a Battery in an Energy Storage System (ESS) under Various Operating Conditions and Monitoring Study of ESS Connected with Photovoltaic (에너지 저장 시스템 (ESS)용 배터리의 운전조건에 따른 성능 저하 및 태양광 연계형 ESS 모니터링 연구)

  • Jung, Euney;Jung, Hanjoo;Jeong, Younki;Lee, Jaeyoung;Lee, Hongki
    • Transactions of the Korean hydrogen and new energy society
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    • v.25 no.3
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    • pp.311-318
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    • 2014
  • Performance degradation of a battery in 20 kWh energy storage system (ESS) under various operating conditions was studied. And energy saving of the ESS was also monitored by connecting with 20 kW photovoltaic (PV). PV-connected ESS saved 5~7% of energy consumption in 2013 compared to that without such system in 2012. As charge-discharge cycle increased, capacity decreased and the performance degradation was glaringly obvious after 40 cycles. And as charge and discharge rate increased, the performance degradation was more serious. After 50 charge-discharge cycles, a lot of degraded product was deposited on the surface of anode and cathode electrodes, and the cathode side was more contaminated. Therefore, in order to maintain the cell performance, it was more important to protect the degradation of the cathode side.